[C:1]([C:3]1[CH:4]=[C:5]([CH:9]=[CH:10][C:11]=1[O:12][CH:13]([CH3:15])[CH3:14])[C:6]([OH:8])=O)#[N:2].C(Cl)(=O)C(Cl)=O.[CH2:22]([CH2:24][NH2:25])[OH:23]>C(Cl)Cl.CN(C=O)C>[C:1]([C:3]1[CH:4]=[C:5]([CH:9]=[CH:10][C:11]=1[O:12][CH:13]([CH3:15])[CH3:14])[C:6]([NH:25][CH2:24][CH2:22][OH:23])=[O:8])#[N:2]To a stirring suspension of 3-cyano-4-isopropoxybenzoic acid (1.0 g, 4.8 mmol) in DCM (20 mL) was added oxalyl chloride (3.7 g, 29.2 mmol) followed by two drops DMF. The reaction mixture was stirred at 50° C. for 2 h. The mixture was concentrated and the residue re-dissolved in DCM (10 mL). Ethanolamine (0.6 g, 9.7 mmol) and TEA (1.45 g, 14.4 mmol) were added and the reaction mixture was stirred overnight at room temperature. The resulting solid was filtered, washed with water, and dried to afford 1.0 g (83%) of 3-cyano-N-(2-hydroxyethyl)-4-isopropoxybenzamide which was used in the next step without purification. LCMS-ESI (ink) calculated for C13H16N2O3: 248.3; found 249.0 [M+H]+, tR=2.41 min. 1H NMR (400 MHz, CDCl3) δ 8.02-7.79 (m, 2H), 6.97-6.87 (m, 1H), 6.71 (s, 1H), 4.65 (dt, J=12.1, 6.1 Hz, 1H), 3.82-3.70 (m, 2H), 3.56 (dd, J=10.2, 5.5 Hz, 2H), 1.96 (d, J=10.0 Hz, 1H), 1.40-1.29 (m, 6H).
読み込み中…
